Expand conditions under which we'll force HLS rendering.

It looks like flinging + MediaPlayer renderer can get us into situations
which cause us to use normal demuxing instead of MediaPlayer. This is
likely due to flinging not returning MediaResource::Type::URL. To fix
this, rely on |demuxer_detected_hls_| flag in addition to the type.

BUG=935755
TEST=none
R=tguilbert

Change-Id: I634c140f63942f08d1407abe5ff5d49a16d9db67
Reviewed-on: https://chromium-review.googlesource.com/c/1488069
Commit-Queue: Dale Curtis <dalecurtis@chromium.org>
Commit-Queue: Thomas Guilbert <tguilbert@chromium.org>
Auto-Submit: Dale Curtis <dalecurtis@chromium.org>
Reviewed-by: Thomas Guilbert <tguilbert@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635369}

media/blink/webmediaplayer_impl.cc

@@ -2514,8 +2514,9 @@ void WebMediaPlayerImpl::StartPipeline() {
                      BindToCurrentLoop(base::BindOnce(
                          &WebMediaPlayerImpl::OnFirstFrame, AsWeakPtr()))));
 
-  if (renderer_factory_selector_->GetCurrentFactory()
-          ->GetRequiredMediaResourceType() == MediaResource::Type::URL) {
+  if (demuxer_found_hls_ ||
+      renderer_factory_selector_->GetCurrentFactory()
+              ->GetRequiredMediaResourceType() == MediaResource::Type::URL) {
     // MediaPlayerRendererClient factory is the only factory that a
     // MediaResource::Type::URL for the moment. This might no longer be true
     // when we remove WebMediaPlayerCast.